body {
    background-color: white;
    color: black;
    text-align: center;
}

header, footer, nav, section, article {
    display: block;
}

header {
    width: 100%;
    background-color: yellow;
}

nav {
    width: 30%;
    background-color: orange;
    float: left;
}

section {
    width: 65%;
    background-color: SpringGreen;
    float: right;
}

article {
    width: 70%;
    margin: 2em 10%;
    background-color: turquoise;
}

footer {
    width: 100%;
    background-color: pink;
    clear: both;
}
